Catic Jasmina, Santurette Sébastien, Dau Torsten
Hearing Systems Group, Department of Electrical Engineering, Technical University of Denmark, DTU Bygning 352, Ørsteds Plads, 2800 Kongens Lyngby, Denmark.
J Acoust Soc Am. 2015 Aug;138(2):1154-67. doi: 10.1121/1.4928132.
The perception of externalization of speech sounds was investigated with respect to the monaural and binaural cues available at the listeners' ears in a reverberant environment. Individualized binaural room impulse responses (BRIRs) were used to simulate externalized sound sources via headphones. The measured BRIRs were subsequently modified such that the proportion of the response containing binaural vs monaural information was varied. Normal-hearing listeners were presented with speech sounds convolved with such modified BRIRs. Monaural reverberation cues were found to be sufficient for the externalization of a lateral sound source. In contrast, for a frontal source, an increased amount of binaural cues from reflections was required in order to obtain well externalized sound images. It was demonstrated that the interaction between the interaural cues of the direct sound and the reverberation strongly affects the perception of externalization. An analysis of the short-term binaural cues showed that the amount of fluctuations of the binaural cues corresponded well to the externalization ratings obtained in the listening tests. The results further suggested that the precedence effect is involved in the auditory processing of the dynamic binaural cues that are utilized for externalization perception.
在混响环境中，针对听众耳朵可获得的单耳和双耳线索，研究了语音声音的外部化感知。使用个性化的双耳房间脉冲响应（BRIR）通过耳机模拟外部化声源。随后对测量的BRIR进行修改，以使包含双耳信息与单耳信息的响应比例发生变化。让听力正常的听众听与这种修改后的BRIR卷积的语音声音。发现单耳混响线索足以实现侧向声源的外部化。相比之下，对于前方声源，为了获得良好的外部化声像，需要增加来自反射的双耳线索量。结果表明，直达声的双耳线索与混响之间的相互作用强烈影响外部化感知。对短期双耳线索的分析表明，双耳线索的波动量与听力测试中获得的外部化评级非常吻合。结果进一步表明，优先效应参与了用于外部化感知的动态双耳线索的听觉处理。
